Dynamic Stability of a Composite Cylindrical Shell with Linear-Variable Thickness under Pulsed External Pressure

2021 ◽  
Vol 94 (2) ◽  
pp. 525-533
Author(s):  
V. N. Bakulin ◽  
A. Ya. Nedbai
Keyword(s):  
Cylindrical Shell ◽  
Dynamic Stability ◽  
Variable Thickness ◽  
External Pressure ◽  
Composite Cylindrical Shell

Dynamic Stability of a Cylindrical Shell under Alternating Axial External Pressure

2017 ◽  
Vol 60 (4) ◽  
pp. 508-513 ◽  
Author(s):  
V. N. Bakulin ◽  
E. N. Volkov ◽  
A. I. Simonov
Keyword(s):  
Cylindrical Shell ◽  
Dynamic Stability ◽  
External Pressure

Dynamic stability of nanocomposite viscoelastic cylindrical shells coating with a piezomagnetic layer conveying pulsating fluid flow

2017 ◽  
Vol 24 (3) ◽  
pp. 401-414 ◽  
Author(s):  
Ali Ghorbanpour Arani ◽  
Seyed Abolfazl Mortazavi ◽  
Zahra Khoddami Maraghi
Keyword(s):  
Cylindrical Shell ◽  
Dynamic Stability ◽  
Polyvinylidene Fluoride ◽  
Fluid Velocity ◽  
Orientation Angle ◽  
Boron Nitride Nanotubes ◽  
Geometrical Parameters ◽  
Composite Cylindrical Shell ◽  
Viscoelastic Composite ◽  
Pulsating Fluid

AbstractIn this study, the dynamic stability of an embedded viscoelastic composite cylindrical shell reinforced by boron nitride nanotubes (BNNTs) is investigated. The composite cylindrical shell is coated by a viscoelastic piezomagnetic layer and subjected to combined magneto-electro-mechanical loads. The composite polymer matrix and the coating layer are made of polyvinylidene fluoride (PVDF) and iron oxide (CoFe2O4), respectively. The composite cylindrical shell conveys pulsating fluid flows, which results in harmonic oscillations. The equivalent characteristics of composite are determined using micro-electro-mechanical models. Considering the magneto-electro-mechanical coupling, motion equations are obtained using Hamilton’s principle. Results show the influences of fluid velocity, geometrical parameters of shell, viscoelastic foundation, orientation angle and percentage of BNNTs on the resonance frequency and stability of a PVDF-coated nanocomposite shell. The result of this study may be used for the design of rotating machines, hydraulic systems and motors.

Dynamic Stability of an Isotropic Metal Foam Cylindrical Shell Subjected to External Pressure and Axial Compression

2011 ◽  
Vol 78 (4) ◽  
Author(s):  
Tomasz Belica ◽  
Marek Malinowski ◽  
Krzysztof Magnucki
Keyword(s):  
Cylindrical Shell ◽  
Dynamic Stability ◽  
Metal Foam ◽  
Circular Cylindrical Shell ◽  
Equations Of Motion ◽  
Element Model ◽  
External Pressure ◽  
Combined Loads ◽  
Nonlinear Approach ◽  
Isotropic Metal

This paper presents a nonlinear approach with regard to the dynamic stability of an isotropic metal foam circular cylindrical shell subjected to combined loads. The mechanical properties of metal foam vary in the thickness direction. Combinations of external pressure and axial load are taken into account. A nonlinear hypothesis of deformation of a plane cross section is formulated. The system of partial differential equations of motion for a shell is derived on the basis of Hamilton’s principle. The system of equations is analytically solved by Galerkin’s method. Numerical investigations of dynamic stability for the family of cylindrical shells with regard to analytical solution are carried out. Moreover, finite element model analysis is presented, and the results of the numerical calculations are shown in figures.

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